Kevin Sinfield has detailed the final leg of a monumental challenge that has raised millions for motor neurone disease (MND) charities.Former England rugby league captain Sinfield will take on the feat of running seven ultramarathons across seven consecutive days.Sinfield (centre) is once again running long distances to raise money for MNDGettySince November 2020, he has been fundraising in tribute to his ex-Leeds Rhinos teammate Rob Burrow, who sadly passed away in 2024.Burrow, who won 15 caps for England, was diagnosed with MND aged 37 in December 2019.MND is a rare, life-shortening neurological condition that causes the weakening of muscles, and there is currently no cure.Before his passing, Burrow helped Sinfield raise money and awareness for the disease by running the Leeds marathon in 2023.Since then, Sinfield has honoured his friend’s legacy by continuing to take on extreme challenges in hopes of raising more donations, with a staggering £11million already accumulated.The last challenge – 7 in 7: The Grand Finale – could be the biggest one yet as he and his team will run seven consecutive ultramarathons, with each day split into 7km blocks that he must beat within an hour.They will visit all 12 English Super League stadiums, including Leeds, en route and finish at Old Trafford for the Grand Final on October 3.“We’re coming back up north, we’ve spent a couple of years on the road and travelled around,” Sinfield explained to talkSPORT.“We felt for the seventh one, to represent Rob properly, where he’s played all his rugby career, that we’d run across the M62. “We’ll start in Hull (Hull FC and Hull Kingston Rovers) and hit every English Super League club along the way.”Sinfield is doing all he can to raise awareness for MND in tribute to BurrowGettyThe pair played alongside each other for Super League team Leeds RhinosGettyOn the support that he and his team have received, Sinfield added: “It’s been awesome. I think where we are now, coming up to our seventh challenge, the support we’ve had has been incredible.“I think we got lucky, we set out during COVID on the first one and we had the rule of six, we had all the different legislation in place that we were trying to abide by. “Charity events were taking place, sports games were taking place but with no crowds. People had a lot of furlough money that they didn’t know how to spend, and I think they took it our way. “With the wonderful support of BBC Breakfast, who’ve been awesome throughout the whole of this, the people who’ve got behind us… we can’t thank people enough. “The MND community feel like they’re being listened to, they feel cared for, they feel important, they feel loved, and that’s been a big driver in all of this. “The money is crucial but I wanted to make people, over the last six or seven years, feel important.”Sinfield has one final challenge to take on in memory of BurrowGettySinfield wore the no. 7 shirt as scrum-half for Leeds and is also aiming to sell 7,777 pairs of sports socks as part of his Sock It To MND drive.All profits from the sales will be sent to charities supporting MND and his total fundraising count.The first of Sinfield’s seven challenges took place in 2020 as he ran seven marathons in as many days, raising £2million after an initial target of £77,777.He raised the same amount a year later by running from Leicester to Leeds, covering 101 miles in just 24 hours.Sinfield then did seven ultramarathons in seven days in 2022, finishing at the Rugby League World Cup final, before pushing Burrow in a wheelchair when they took on the 2023 Leeds Marathon.Alongside his team, he ran over 50km each day for seven days across various regions around the United Kingdom, with last year’s seven in seven ultramarathons the penultimate challenge.